Maven必须配置

<dependency>
    <groupId>org.apache.kafka</groupId>
    <artifactId>kafka-clients</artifactId>
    <version>2.4.1</version>
</dependency>

Java实现

package com.qf.kafka;

import org.apache.kafka.clients.producer.*;
import org.apache.kafka.common.serialization.StringSerializer;

import java.util.Properties;
import java.util.concurrent.ExecutionException;

public class MyProducer {
    // 定义TOPIC名称
    private final static String TOPIC_NAME = "my-replicated-topic";

    public static void main(String[] args) throws ExecutionException, InterruptedException {
        // 1.设置参数
        // 使用 Properties对象 存放键值对(参数配置信息)
        Properties props = new Properties();
        // 键值对中存入 bootstrap_server => kafka节点或集群(用逗号隔开)
        props.put(ProducerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.232.136:9092,192.168.232.136:9093,192.168.232.136:9094");
        // 把需要发送的key从字符串序列化为字节数组
        props.put(ProducerConfig.KEY_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());
        // 把需要发送的value从字符串序列化为字节数组
        props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, StringSerializer.class.getName());

        // 2.创建生成消息的客户端，传入参数
        KafkaProducer<String, String> producer = new KafkaProducer<String, String>(props);

        // 3.创建消息
        // 未指定发送分区，具体发送的分区计算公式:hash(key)%partitionNum
        // key:决定了往分区上发；value：具体要发送的消息内容
        ProducerRecord<String, String> producerRecord = new ProducerRecord<String, String>(TOPIC_NAME, "mykeyvalue", "hello kafka");

        // 4.发送消息,得到消息发送的元数据并输出
        RecordMetadata metaData = producer.send(producerRecord).get();
        System.out.println("同步方式发送消息结果：" + "topic-" + metaData.topic() + "|partition-" + metaData.partition() + "|offset-" + metaData.offset());
    }
}